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Online retail sales staged a strong recovery Monday, growing 15% over the Monday after Thanksgiving a year ago, comScore Inc. reports. Sales of $846 million made Dec. 1 the second heaviest shopping day in online retailing history.

Online retail sales staged a strong recovery Monday, growing 15% over the Monday after Thanksgiving a year ago, comScore Inc. reports. Sales of $846 million made Dec. 1 the second heaviest shopping day in online retailing history.